25 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Separate variables, integrate both sides, and don’t forget + C.
“Rate proportional to amount” → dy/dt = ky → y = y₀eᵏᵗ.
For slope fields, match segment slopes to dy/dx at sample points.
Read the explanations even when you got it right, and apply the initial condition to find C.